package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     * @param orders
     */
    @Transactional
    public void submit(Orders orders) {
        //检查购物车数据是否存在
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        for (ShoppingCart shoppingCart : list) {
            Integer number = shoppingCart.getNumber();
            if (number==0){
                throw new CustomException("请剔除不需要的订单");
            }
        }
        if ((list==null||list.size()==0)){
            throw new CustomException("购物车为空，不能下单");
        }
        //检查地址信息
        Long addressBookId = orders.getAddressBookId();
        AddressBook one = addressBookService.getById(addressBookId);
        if (one==null){
            throw new CustomException("用户地址信息有误，不能下单");
        }

        //保证原子性，线程安全。amount 金额，
        AtomicInteger amount = new AtomicInteger(0);
        //设置唯一订单号
        long orderId = IdWorker.getId();
        //设置菜单明细
        List<OrderDetail> orderDetails=list.stream().map((item)->{
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //计算总价钱
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());
        //向订单明细表插入多条数据
        orderDetailService.saveBatch(orderDetails);
        //清空购物车数据
        shoppingCartService.remove(queryWrapper);
        //查询用户信息
        User byId = userService.getById(BaseContext.getCurrentId());
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(BaseContext.getCurrentId());
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(byId.getName());
        orders.setConsignee(one.getConsignee());
        orders.setPhone(one.getPhone());
        orders.setAddress((one.getProvinceName() == null ? "" : one.getProvinceName())
                + (one.getCityName() == null ? "" : one.getCityName())
                + (one.getDistrictName() == null ? "" : one.getDistrictName())
                + (one.getDetail() == null ? "" : one.getDetail()));
        //向订单表插入数据，一条数据
        this.save(orders);
    }
}